Want to see how others played a song? Check the song leaderboard. You can access it by tapping on the score located in the top right hand corner of the song screen.
If you have played the song before, your score will be highlighted in the lower section. You can also toggle between My level, Global and Friends views.
When playing past Weekly Challenge songs, your scores are saved but the Weekly Challenge leaderboard is not updated. You can view your score for the song by finding it with song search. Open the song and tap the score in the top right hand corner to view your score.